<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
        <el-row>
            <el-col>
                <el-button type="primary" @click="showAddDialog">添加分类</el-button>
            </el-col>
        </el-row>
        <!-- 表格区域 -->
        <tree-table
            :data="dataList"
            :columns="columns"
            :selection-type="false"
            :expand-type="false"
            show-index
            index-text="#"
            border
        >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: green;"></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>
          <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
            <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
            <el-tag size="mini" type="warning" v-else>三级</el-tag>
          </template>
          <template slot="opt" slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          </template>
        </tree-table>
        <!-- 分页区域 -->
        <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange"
                     :current-page="queryInfo.pagenum" :page-sizes="[1, 2, 5, 10]"
                     :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
        </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addDialogVisible" width="50%"
    @close="addDialogClosed">
      <!-- 内容主体区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
      label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <el-cascader expand-trigger="hover" :props="cascadeProps"
            :options="parentList" v-model="selectKeys"
            @change="parentCateChanged" clearable change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return {
            addDialogVisible: false,
            addForm: {
              cat_name: '',
              cat_pid: 0,
              cat_level: 0
            },
            addFormRules: {
              cat_name: [
                { required: true, message: '分类名称不能为空!', trigger: 'blur' }
              ]
            },
            queryInfo:{
                type: 3,
                pagenum: 1,
                pagesize: 5
            },
            dataList: [],
            total: 0,
            columns: [
                {
                    label: '分类名称',
                    prop: 'cat_name'
                },
                {
                  label: '是否有效',
                  type: 'template',
                  template: 'isok'
                },
                {
                  label: '排序',
                  type: 'template',
                  template: 'order'
                },
                {
                  label: '操作',
                  type: 'template',
                  template: 'opt'
                }
            ],
            parentList: [],
            selectKeys: [],
            cascadeProps:{
              value: 'cat_id',
              label: 'cat_name',
              children: 'children'
            }
        }
    },
    created(){
        this.getDataList()
    },
    methods:{
        async getDataList(){
            const {data: res} = await this.$http.get('categories',{params: this.queryInfo})
            if (res.meta.status !== 200){
                return this.$message.error('获取分类列表失败！')
            }
            this.dataList = res.data.result
            this.total = res.data.total
            console.log(this.dataList)
        },
        // 监听 pagesize 改变的事件
        handleSizeChange(newSize) {
          // console.log(newSize)
          this.queryInfo.pagesize = newSize
          this.getDataList()
        },
        // 监听 页码值 改变的事件
        handleCurrentChange(newPage) {
          this.queryInfo.pagenum = newPage
          this.getDataList()
        },
        showAddDialog(){
          this.addDialogVisible = true
          this.getParentList()
        },
        async getParentList(){
            const {data: res} = await this.$http.get('categories',{params: {type:2}})
            if (res.meta.status !== 200){
                return this.$message.error('获取父级分类失败！')
            }
            console.log(res.data)
            this.parentList=res.data
        },
        parentCateChanged(){
          if (this.selectKeys.length > 0) {
            this.addForm.cat_pid = this.selectKeys[this.selectKeys.length - 1]
            this.addForm.cat_level = this.selectKeys.length
            return false
          } else {
            this.addForm.cat_pid = 0
            this.addForm.cat_level = 0
          }
        },
        addDialogClosed(){
          this.selectKeys=[]
          this.addForm.cat_name=''
          this.addForm.cat_pid=0
          this.addForm.cat_level=0
        },
        addData(){
          this.$refs.addFormRef.validate(async valid=>{
            if(!valid) return
            const {data: res} = await this.$http.post('categories', this.addForm)
            if (res.meta.status !== 201){
                return this.$message.error(res.meta.msg)
            }
            this.$message.success('添加分类成功')
            this.getDataList()
            this.addDialogVisible=false
          })
        }
        
    }
}
</script>

<style lang="less" scoped>
.el-cascader{
  width: 100%;
}
</style>
